Welcome to 'Leट K' Repository.

This is source code for a Home Automation App which controls home appliances using Bluetooth module.

Installing

You can Directly Install apk from releases or You can clone the repository in Android Studio or download and extract the zip and open the folder as project and build or test apk from there.

Hardware Components

Used Bluetooth Module (HC- 05) and Temperature Sensor with Arduino UNO and 3 bulbs and 3 fans as a prototype.

Hardware Setup

Pin	Device
4	Bulb 2
5	Mode 1(Of Fan)
6	Mode 2(Of Fan)
7	Fan 1
8	Fan 2
10	Mode 3(Of Fan)
11	Fan (Slider)
13	Bulb 1
A1	Temperature Sensor

Load the Following Code into the Arduino

#include <SoftwareSerial.h>
char data;
int val;
#define bulb1 13
#define bulb2 4
#define fan 7
#define fan1 8
#define mode1 5
#define mode2 6
#define mode3 10
#define slider 11
#define temp A1
void setup(){
Serial.begin(9600);
while (!Serial) {
;
}
pinMode(bulb1,OUTPUT);
pinMode(bulb2,OUTPUT);
pinMode(fan,OUTPUT);
pinMode(fan1,OUTPUT);
pinMode(mode1,OUTPUT);
pinMode(mode2,OUTPUT);
pinMode(mode3,OUTPUT);
pinMode(fan1,OUTPUT);
pinMode(slider,OUTPUT);
}

void loop() {
val = analogRead(temp);
float mv = ( val/1024.0)*5000;
float cel = mv/10;

if (Serial.available())
{
data= Serial.read();
if(data == 'T'){
Serial.print(cel);
delay(500);
}
if(data=='B') //Bulb1
{
digitalWrite(bulb1,1);
}
if(data=='b')
{
digitalWrite(bulb1,0);
}
if(data=='z') //Bulb2
{
digitalWrite(bulb2,1);
Serial.println("Bulb2 on");
}
else if(data=='a')

{
digitalWrite(bulb2,0);
Serial.println("Bulb2 off");
}
if(data=='C') //Fan
{
digitalWrite(fan,1);
Serial.println("Fan on");
}
if(data=='c')
{
digitalWrite(fan,0);
Serial.println("Fan off");
}
if(data=='D') //mode1
{
analogWrite(mode2,50);
Serial.println("mode1 on");
}
if(data=='d')
{
analogWrite(mode2,0);
Serial.println("mode1 off");
}
if(data=='E') //mode2
{
analogWrite(mode2,150);

Serial.println("mode2 on");
}
if(data=='e')
{
analogWrite(mode2,0);
Serial.println("mode2 off");
}
if(data=='H') //mode3
{
analogWrite(mode2,255);
Serial.println("mode3 on");
}
if(data=='h')
{
analogWrite(mode2,0);
Serial.println("mode3 off");
}
if(data=='G')
{
int sliderval1 = Serial.parseInt();
analogWrite(slider,sliderval1);
Serial.println(sliderval1);
}
}
}

Signal and its meaning

ASCII Character	Signal to Arduino	Output from Arduino
'T'	Tempreature Signal	Calculated Float Value to Bluetooth Outputstream
'B' or 'b'	Bulb 1	Toggles the Bulb 1 (on for 'B', off for 'b')
'z' or 'a'	Bulb 2	Toggles the Bulb 2
'C' or 'c'	Fan	Toggles the Fan 1
'D' or 'd'	Fan (Mode 1)	Toggles the Fan (Mode 1)
'E' or 'e'	Fan (Mode 2)	Toggles the Fan (Mode 2)
'H' or 'h'	Fan (Mode 3)	Toggles the Fan (Mode 3)
'G'	Fan (Slider)	Activate the Inputstream of Aurduino for float input
Float Value of Slider	Fan (Slider)	Sets the Fan speed

*Note: Values of Float Range From 0 to 255

Feel Free to Fork/Edit

You are free edit the code, make your own modified version and/or use as it is.